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Beginning Balance, Annual Activity and Ending Balance of Foreign Currency Translation Adjustment Included as Component of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance $ 339,660 $ 334,207 $ 344,156       $ 344,156  
FX translation (83) 324 (9,063) $ (1,080)     (8,822) $ (2,192)
Balance 344,794 339,660 334,207       344,794  
Foreign Currency Translation Adjustments                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance (14,437) (14,761) (5,698) (5,619) $ (6,276) $ (4,507) (5,698) (4,507)
FX translation (83) 324 (9,063) (1,080) 657 (1,769)    
Balance $ (14,520) $ (14,437) $ (14,761) $ (6,699) $ (5,619) $ (6,276) $ (14,520) $ (6,699)